Answer: Hello There!...............
The universe is all of space and the matter in it which includes galaxies that includes clusters and super clusters. It also has areas with very little matter called voids.
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b) because stevie always knew something about everything, grandpa always called him "a walking encyclopedia."
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The key concept for our discussion here is that the accelerating expansion of the universe is an innate property of spacetime itself on scales where spacetime no longer acts like traditional gravity. In summary, the influence of gravity only extends to the edge of each gravity group. Beyond that, spacetime no longer behaves like gravity.
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He usually leaves at 9:00 o’clock but this morning he left home late